pci: Convert msi_init() to Error and fix callers to check it

msi_init() reports errors with error_report(), which is wrong
when it's used in realize().

Fix by converting it to Error.

Fix its callers to handle failure instead of ignoring it.

For those callers who don't handle the failure, it might happen:
when user want msi on, but he doesn't get what he want because of
msi_init fails silently.

cc: Gerd Hoffmann <kraxel@redhat.com>
cc: John Snow <jsnow@redhat.com>
cc: Dmitry Fleytman <dmitry@daynix.com>
cc: Jason Wang <jasowang@redhat.com>
cc: Michael S. Tsirkin <mst@redhat.com>
cc: Hannes Reinecke <hare@suse.de>
cc: Paolo Bonzini <pbonzini@redhat.com>
cc: Alex Williamson <alex.williamson@redhat.com>
cc: Markus Armbruster <armbru@redhat.com>
cc: Marcel Apfelbaum <marcel@redhat.com>

Reviewed-by: Markus Armbruster <armbru@redhat.com>
Signed-off-by: Cao jin <caoj.fnst@cn.fujitsu.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Hannes Reinecke <hare@suse.com>

1 files changed, 21 insertions, 5 deletions

diff --git a/hw/scsi/megasas.c b/hw/scsi/megasas.c
index 636ea73adb..6eb57ff61b 100644
--- a/hw/scsi/megasas.c
+++ b/hw/scsi/megasas.c
@@ -29,7 +29,7 @@
 #include "hw/scsi/scsi.h"
 #include "block/scsi.h"
 #include "trace.h"
-
+#include "qapi/error.h"
 #include "mfi.h"
 
 #define MEGASAS_VERSION_GEN1 "1.70"
@@ -2330,6 +2330,8 @@ static void megasas_scsi_realize(PCIDevice *dev, Error **errp)
     MegasasBaseClass *b = MEGASAS_DEVICE_GET_CLASS(s);
     uint8_t *pci_conf;
     int i, bar_type;
+    Error *err = NULL;
+    int ret;
 
     pci_conf = dev->config;
 
@@ -2338,6 +2340,24 @@ static void megasas_scsi_realize(PCIDevice *dev, Error **errp)
     /* Interrupt pin 1 */
     pci_conf[PCI_INTERRUPT_PIN] = 0x01;
 
+    if (megasas_use_msi(s)) {
+        ret = msi_init(dev, 0x50, 1, true, false, &err);
+        /* Any error other than -ENOTSUP(board's MSI support is broken)
+         * is a programming error */
+        assert(!ret || ret == -ENOTSUP);
+        if (ret && s->msi == ON_OFF_AUTO_ON) {
+            /* Can't satisfy user's explicit msi=on request, fail */
+            error_append_hint(&err, "You have to use msi=auto (default) or "
+                    "msi=off with this machine type.\n");
+            error_propagate(errp, err);
+            return;
+        } else if (ret) {
+            /* With msi=auto, we fall back to MSI off silently */
+            s->msi = ON_OFF_AUTO_OFF;
+            error_free(err);
+        }
+    }
+
     memory_region_init_io(&s->mmio_io, OBJECT(s), &megasas_mmio_ops, s,
                           "megasas-mmio", 0x4000);
     memory_region_init_io(&s->port_io, OBJECT(s), &megasas_port_ops, s,
@@ -2345,10 +2365,6 @@ static void megasas_scsi_realize(PCIDevice *dev, Error **errp)
     memory_region_init_io(&s->queue_io, OBJECT(s), &megasas_queue_ops, s,
                           "megasas-queue", 0x40000);
 
-    if (megasas_use_msi(s) &&
-        msi_init(dev, 0x50, 1, true, false)) {
-        s->msi = ON_OFF_AUTO_OFF;
-    }
     if (megasas_use_msix(s) &&
         msix_init(dev, 15, &s->mmio_io, b->mmio_bar, 0x2000,
                   &s->mmio_io, b->mmio_bar, 0x3800, 0x68)) {